How do I rotate some text?
If you 'typed it out' in Blender I'm assuming you used the text tool. If that is the case, then you have been wasting time, since it is still a curve object and will also have a messed up topology.

Text tools are just a special type of Bezier curve objects, so if you plan on converting to mesh might as well have just used the one imported from SVG you already had directly.

Curve objects are actually an underrated and powerful modeling tool to use, if you don't plan on converting to a mesh object later. That will often lead to triangulated uneven topology, unless you do some serious manual cleanup work.

If you don't plan on doing any heavy edits and shape modifications I'd recommend leaving them as curves objects.

Create your text then in Object Mode press Alt + C > Convert to Curve, then use the built in curve properties (not a Solidify modifier) for extrusion. You'll have the added benefit of procedural non destructive beveling and allow easy tweaking of the character's shapes by controlling the bezier curve handles in edit mode.

About rotation I'm assuming you want to rotate each character individually, if that's the case you either have to rotate them in Edit Mode individually (after converting to Bezier Curve or Mesh) or separate each character into it's own object (L to select all linked geometry and P to separate), then rotating each individually in Object Mode

If you plan on doing geometry heavy changes to you logo however, then I'd recommend a different approach and start from scratch modeling you logo as a mesh. It may be harder at the beginning, but with a good starting topology it may well compensate in the long run